Electrical heater



' No Model.)-

W; MITCHELL. ELECTRICAL HEATER.-

No. 474,797. Patented May 10, 1892.

UNITED STATES WILLIS MITCHELL, OF MALDEN, ASSIGNOR TO THEBUTTERFIELD-MITOHELL PATENT OFFICE.

ELECT-RIG HEATING COMPANY, OF BOSTON, MASSACHUSETTS.

ELECTRICAL HEATER.

SPECIFICATION forming part of Letters Patent No. 474,797, dated May 10,1892.

Application filed December 14:, 1891- Serial No. 414,960. (No model.)

To all whom it may concern.-

Be it known that 1, Hum MITCHELL, a citizen of the United States,residing at Malden, in the county of Middlesex and State ofMassachusetts, have invented certain new and useful Improvements inElectric Oar-Heaters; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the [0 art to which it appertains to make and use thesame.

This invention relates to that class of electricheating devices in whicha wire forming part of an electric circuit is Wound in successiveconcentric coils or helicesproperly insulated from each other andineased to form acylindrical or approximately cylindrical heater.

The object of my present improvement is to adapt heaters of this classmore perfectly to be used in cars and other conveyances and in roomsgenerally.

To this end my said invention consists, chiefly, in the combination of asupportingstand with the said heater andits frame-work,

z5' the said parts being especially adapted to each other byconstruction, substantially as set forth.

' In the accompanying drawings, Figure 1 represents a longitudinalsection through an electric heater embodying my invention. Fig. 2represents a detail perspective view of the tubular core thereof. Fig. 3represents a similar view of the said core with the wire and insulatinglayers or partitions thereon. Fig. 5 4 represents an end View of thesaid heater. Fig. 5 represents a detail view of the spider used withinit. Fig. 6 represents a detail view in elevation of thesupporting-stand, its nut being slightly detached. Fig. 7 represents adetail view of the spacing-sleeve to be placed thereon; and Fig. 8represents a view, partly in section, partly in elevation, of the heaterand supporting-stand as put together for use.

A designates the tubular metallic core of the heater, provided withexternal annular flanges a at its ends. Within this tubular core aspider B, of metal having the same coefficient ofexpansion under heat,is fastened to the said core by rivets, screws, hard solder,

or other suitable means, the ends of the arms ,where equal to that ofthe annular flanges a.

D designates a supporting-standard consisting of a tube which isscrew-threaded at each end, the lower-end being turned into ascrew-threaded recess of a base E and the upper end receiving a nut F.This upper end extends up through a central opening B of the hub-of thesaid spider. Aspacing-sleeve G is slipped upon the said standard andrests on the said base, extending up far enough, so that when the saidnut is turned home it will clamp the said spider against the upper endof the said spacing-sleeve and thus hold it in place. The wire 0 has itsends contiguous, and these are extended together through an opening m inthe said sleeve and an opening n in the said tubular standard to theinterior of the latter, thence down, and out through the base E by anopening 6. The tubular standard, base, nut, and spacing-sleeve togethermake up a stand for the said heater, which supports it securely at aconvenient height and very securely, although the elements of it areeasily taken apart. A switch may be employed on the said base orwherever convenient to open and close electrical connection. The standas a whole may be insulated. The wire where passing through it shouldhave an insulating coating.

Having thus described my invention, what I 9c claim as new, and desireto secure by Letters Patent, is

1. In combination with a tubular electric heater having a spider withinit, a stand connected detachably to the said spider, substantially asset forth.

2. In combination with an electric heater, a stand provided with atubular standard which supports the said heater, an arm or arms to whichthe said heater is attached, and a base I00 having openings, the wire ofsaid heater passing through the said standard and base, subsleeve, and atubular electric heatersurrounding and attached to the said standard,substantially as set forth. a

In testimony whereof I affix my signature in presence of two Witnesses.

,WILLIS MITCHELL.

Witnesses:

EDWIN W. PIERCE, PELA'IIAH R. SRIPP.

